core: Bump the chunk size for ptr_table uses in types, tags, functions tables
On a:
$ grep "model name" /proc/cpuinfo
model name : Intel(R) Core(TM) i5-7500 CPU @ 3.40GHz
model name : Intel(R) Core(TM) i5-7500 CPU @ 3.40GHz
model name : Intel(R) Core(TM) i5-7500 CPU @ 3.40GHz
model name : Intel(R) Core(TM) i5-7500 CPU @ 3.40GHz
$
Before, using 256 as the chunk size:
$ perf stat -r5 pahole -j --btf_encode vmlinux
Performance counter stats for 'pahole -j --btf_encode vmlinux' (5 runs):
8,336.57 msec task-clock:u # 2.649 CPUs utilized ( +- 0.19% )
0 context-switches:u # 0.000 /sec
0 cpu-migrations:u # 0.000 /sec
69,028 page-faults:u # 8.260 K/sec ( +- 0.03% )
28,799,380,143 cycles:u # 3.446 GHz ( +- 0.06% )
66,068,272,802 instructions:u # 2.29 insn per cycle ( +- 0.00% )
15,801,729,716 branches:u # 1.891 G/sec ( +- 0.00% )
134,370,099 branch-misses:u # 0.85% of all branches ( +- 0.07% )
3.14696 +- 0.00527 seconds time elapsed ( +- 0.17% )
$
After bumping it to 1024:
$ perf stat -r5 pahole -j --btf_encode vmlinux
Performance counter stats for 'pahole -j --btf_encode vmlinux' (5 runs):
8,255.93 msec task-clock:u # 2.635 CPUs utilized ( +- 0.03% )
0 context-switches:u # 0.000 /sec
0 cpu-migrations:u # 0.000 /sec
68,597 page-faults:u # 8.312 K/sec ( +- 0.04% )
28,504,209,806 cycles:u # 3.454 GHz ( +- 0.03% )
66,067,020,098 instructions:u # 2.32 insn per cycle ( +- 0.00% )
15,802,624,183 branches:u # 1.915 G/sec ( +- 0.00% )
133,542,603 branch-misses:u # 0.85% of all branches ( +- 0.13% )
3.13324 +- 0.00205 seconds time elapsed ( +- 0.07% )
$
And 2048:
$ perf stat -r10 pahole -j --btf_encode vmlinux
Performance counter stats for 'pahole -j --btf_encode vmlinux' (10 runs):
8,237.37 msec task-clock:u # 2.635 CPUs utilized ( +- 0.02% )
0 context-switches:u # 0.000 /sec
0 cpu-migrations:u # 0.000 /sec
68,643 page-faults:u # 8.331 K/sec ( +- 0.06% )
28,447,701,874 cycles:u # 3.453 GHz ( +- 0.02% )
66,077,728,879 instructions:u # 2.32 insn per cycle ( +- 0.00% )
15,806,113,927 branches:u # 1.918 G/sec ( +- 0.00% )
132,811,965 branch-misses:u # 0.84% of all branches ( +- 0.11% )
3.125675 +- 0.000905 seconds time elapsed ( +- 0.03% )
$
Value chosen using:
$ pahole --ptr_table_stats --btf_encode vmlinux
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
1 file changed
